Labels:book | reckoner | sky OCR: KENWOOD SB -988 SERVICE BULLETIN Amateur Radio Division SUBJECT TS. -940S MRF -485 Driver Transistor Notes DATE Janurary 16 1992 If Some these MRF transistors 485 are transistors installed are being without supplied by modifiying Motorola the driver with bias Green circuit OT there Blue color very ranking. strong possiblity that they will fail within a very short time frame These high gain transistors cause the circuit to become unstable which can cause the circuit to break into self oscillation and therefore self-destruct Recommendations: Use of Red Orange Or Yellow hfe color rankings is recommend These lower gain transistors work just fine and do not suffer from the circuit instability problem. If you are only able obtain the higer gain transistors you will need to modify the varistor/te ...
.iso/mods/kenwood/servbull/asb0988a.jpg){kind=small}
.iso/mods/kenwood/servbull/asb0987.jpg){kind=link}
.iso/mods/kenwood/servbull/asb0988b.jpg){kind=link}